Motion-picture-projector gearing.



n. P. snnamm '& o. o. TAYLOR.

MOTION HCTURE PROJECTOR GEAMNG.

APPLICATION "LID OCT. 5. I915.

Patented Jan. 11, 1916.

. 16 drives to a UNITED STATES PATENT OFFICE.

RALPH P. BTINEMAN AND DNA 0. TAYLOR, OF SAN DIEGO, CALIFORNIA.

IOTION-PICTURE-PBOJECTOB GEABING.

Specification of Letters Patent.

Patented J an. 11, 1916.

To all whom it may concern:

Be it known that we, RALPH P. S'rmmran' and Own 0. Taruon, citizens of the United States of America, residing at San Diego, in the county of San Diego and State of California, have invented certain new and useful Improvements in Motion-Picture Projector Gearing, of which the following 18 a s ification.

is invention relates to a motion icture machine and more particularly to t e film actuatin mechanism of this machine.

The ject of the invention is to provide an improved driving means for the film of a motion picture machine constructed in such manner that ictures upon the film will be presented be ore the lens at the usual number minute, but will be actuated at double t e usual rate of speed during the time that they are moving. Consequently the length of time that is necessary to kee the shutter shut will be reduced by hal and the result will be that much of the ob jectionable flicker will be eliminated and the amount of light required will be reduced.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawings, Figure 1 is a plan view of a mechanism constructed in accordance with the invention. Fig. 2 is a detailed view of a two pin Geneva movement hereinafter described, and Fig. 3 is a like view of a single pin Geneva movement.

Like numerals designate corresponding parts in all of the figures of the drawings.

The mechanism forming the subject matter of the present invention, may if desired, be mounted within a casing 5 so that it may run in oil, but this orms no part of the invention proper. This casing forms bearings indicated In a general way at 6 supthe several shafts hereinafter deson 8 designates the main driving shaft to which motion is applied through a pinion 9. This shaft carries a balance or fly wheel 10 and a disk 11 of a single pin Geneva movement. The pin of this movement is indicated at 12, and the disk 11 carries the usual segmental boss 13 which is cut out at 14.- to permit the pro ecting members of a star wheel 15 to pass therethrough when the pin 12 engages said star wheel. The star wheel 15 is mounted lslpon a shaft 16 and this shaft aft 17 through the medium of a. two-to-one gearing comprising the gear 18 and pinion 19. It is apparent therefore that shaft 17 will rotate at double the rate of speed of shaft 16. Mounted upon the shaft 17 is a disk 20 of a two pin Geneva movement. The pins 21 of this disk are moimted diametrically opposite each other and the disk carries curved ribs 22 which are spaced from each other to leave the cut out portions 23 and 24 through which the projecting portions of the star wheel may pass when t e pins 21 engage the star wheel in the usual way. Both the star wheel 25 and the star wheel 15 are provided with the usual radial recesses 27 and 28 with which the pins 21 and 12 engage in the usual way. The star wheel 26 is mounted upon the shaft 27 of the film carrying sprocket wheels 29.

The elements herein described down to and including star wheel 15 and shaft 16 corr ond with the elements heretofore used or imparting the necessarystep by step movement to the sprocket carrying shaft of a motion icture machine. However it is to be noted that the addition of the remaining elements that is those numbered from 18 to 26 results in securing the objects and advantages sought. Assumin that the fly wheel 10 rotates at the rate of 16 revolutions per second it follows that the star wheel 15 and shaft 16 will rotate at the rate of 4 revolutions per second. The twoto-one gearing will result in rotating the shaft 17 at the rate of 8 revolutions per sec- 0nd and since an impulse is imparted to star wheel 26 at every half revolution of disk 20 it follows that the star wheel 26 and shaft 27 together with the film carrying sprockets 28 will rotate at the rate of four revolutions per second, that is they will receive just as many revolutions per second as the star wheel 15 and the shaft 16, but durin the time that movement is being impa to the film carrying sprockets they are moved at double the rate of speed of star wheel 15, whereb the objects hereinbefore set forth are efiiciently achieved.

While the elements shown and described are well adapted to serve the purposes for which they are intended it is to be understood that many other embodiments of the inventive idea involved may be resorted to without de arture from the invention.

Having ascribed our invention what we claim is:

The combinai? in with a driving shaft and a filin carrying driven shaft of an intermediate shaft, a single pm Geneva movement between the driving shaft and said in- In testimony whereof we afflx ouraignatures in the presence of two witnesses.

termediate shaft 0 double pin Geneva move- RALPH STINEMAN' 5 ment between the fihn carrying shaft and DNA TAYLOR said intermediate shaft and a two-to-one Witnesses:

fining between said intermedlate shaft and WmmAM Km'rn an,

t e last named Geneva movement. Many G. Gaaauumv.

00p! a m. patent may be obtained for in out: each, by addrenln: the Oommhalone: 011mm. Washington, D. 0." 

